smocked tube tops are very easy to fake malfunctions on.

Wardrobe malfunction
 

In high school there was a very hot mixed race girl named Shy with straight black hair and green eyes. She had phenomenal body, hour glass shape with a plump bubble butt. I’d never talk to her because I was nervous and I had quite a bit of anxiety when talking to girls that attractive.
We were in the same gym class where we played flag football. Where we have small flags around our waist and the object is to rip off the flags off your opponents waits instead of tackle them.
We split up into boys and girls so the boys played only boys and girls played girls. The girls went first and Shy looked pretty excited. Mid way into the game she had the ball and she was running to get a touchdown at the other end of the gym when one of the girls dived to pull one of the flags off the waist. Unfortunately she missed the flags but got a handful of pants (she was wearing black tights) when she accidentally pulled shy’s pants down bare. Shy immediately fell over and fell onto her hands and knees to catch herself, which seemed to expose her butthole for a few seconds before she pulled her pants up and ran out the gym.
I gent had for her because she seemed very embarrassed, but it took a while for us boys in the class to get over it as we talked about it for weeks.

Not quite
 

This has always been a deep desire of mine. With some girls, or female friends, moreso than others. There was never a malfunction-prone girl unfortunately, but there were singular malfunction events. As for anything recurring, there were events, but I hesitate to call them malfunctions, because not nearly enough was exposed for my liking lol.

There was a girl who would get pantsed more than a little often, because she was hanging out with a group of us boys, and that's what happens when you hang out with a buncha boys, but she usually wore bikini cut and had full coverage. She knew what to expect when she wore a skirt. That skirt would always get lifted. She knew it was coming, even thought it was funny. But she once ripped her jeans across the bottom of one of her butt cheeks. W/ jeans she usually wore a thong because you can't get pantsed with tight jeans so she didn't haveta worry about me seeing her thong (though when you're friends with someone long enough you end up seeing them naked anyway). So she had the bottom of her right butt cheek sticking out of a giant hole in her jeans. It wasn't extremely revealing, relatively speaking, but she was a lot more embarrassed about that happening than anytime she got pantsed. It's always more embarrassing when you're not expecting it.

I've seen a couple bikini top malfunctions which are always exciting, my now-wife, back when we were just friend, had a nip slip right in front of me at the beach, and another really hot, large-boobed friend accidentally slipped out during a pool party, and I was the only one who saw. She still doesn't know I've seen her nipple.

There was once a girl I knew who had big hips and a nice big round booty. Thin girl, but big butt (my favorite). Her jeans would get worn out easily due to her booty-size. So it was actually very often that I'd look down and her jeans would have a little hole in it. It'd just been worn through. And she always wore thongs, so anytime I saw the hole, I'd see skin. I like ENF, so I would usually point it out to her so she'd have that embarrassing moment of realization that a little bit of her butt is showing in public. But she'd always kinda let it roll off her back. After a while she was just more frustrated that she was running out of pants that didn't have a hole in them lol.

Finally, I used to work with a girl that would always wear leggings, and didn't realize that anytime she'd bend over, they'd become basically seethru, and she always wore a thong. Idk that I'd call that a malfunction, but she was unaware for what felt like a year. She must've realized one day, because after a while she stopped wearing them to the office without a long dress or sweater to cover up. But there was a good year or so of booty-flashes through her seethru leggings.

Anne
 

I had 3 Close Encounters with Anne, the last of which I've already described in the Vestal Virgins Visit.

But my first 2 were in High School. A Senior girl, currently awaiting Varsity Entrance, she was so obviously well above my Pay Grade. All the Lads Fancied her. Tall. Blonde. Well stacked. "Plots" were rife about "tripping-up in front of her" and "grabbing her tits on the way down!" But on this hot May Day just 3 of us were sat in the Dining Hall admiring the girls sprawling outside on the adjacent lawn. Then Anne appeared, settling down between a couple of Mates. She wore the Regulation Dark Blue skirt, but her matching, sleeveless Top had a low, wide, scooped, ruched (boat?) neckline. Our Trio of eyes automatically locked onto her as she casually stretched-out, full length, rolling onto her front and raising herself up onto her elbows. There they were, right before our very eyes, her now fully exposed nipple-tipped fulsome tits hanging out of her half-cup bra ! My mate, "Brat", saw my instant erection and reached for my thigh. Vigerous rubbing. Quick Load Shooting. Uniform trousers stained ! We remained anchored till the Girls departed !

A couple of months later I was once again in The Dining Hall, but this time writing-up my Contribution to a Group Project. But each year, the Drama Group put on a Play in the adjacent Main Hall. The "props" were stored under the Stage, but the "rolled-up, painted canvas Back-Drop" was too long. So it had been left half in/out of the side door close to where I was seated. Then the the music started, and about 20 Girls entered. Barefoot, in Navy Blue "elastic top and bottom" knickers and white blouses. "Music & Movement". "Greek Dancing". Whatever. To Piano Accompanyment. Then Anne appeared ! But as befitted a Senior Girl, HER gear was Personally Tailored ! Tiny, faded Briefs. Too-Small blouse with missing Buttons. There she was, bending, stretching, spinning, twisting, cartwheeling, handstanding, star-jumps, toe touching, etc under the bright lights. And I'm sat in seclusion, getting a front-row view! YES! Pubes flashed. Crack outlined through her thin briefs. Buttocks exposed. Tits swinging freely. Nipples poking. And ALL to Music ! I abandoned Writing and stood in the doorway, extracting my throbbing Weapon. My Instant Load shot all over the Scenery !

I did a university course as a mature student later in life. While most of students were much younger than me, there were a few women nearer my age. These women would often sit next to me or partner up with me for activities. I presumed they just felt more comfortable with a man nearer their own age. As I am married, I wasn't interested in pushing things further with any of them.

However, in one class there was a female student of about forty who I never really got to know. She used arrive just as the sessions were starting and always left promptly at the end. I was curious, but never found out much about her, beyond the fact that she was petite and wore glasses. There was something familiar about her that reminded me of a certain type of woman in my home town.

The class was unconventional. It took the form of a seminar involving about twenty five students. There were no desks just chairs arranged in rows facing the lecturer at the front.

The woman arrived when most students were already seated. Apparently by chance, she took the chair directly in front of me. She was wearing a slightly cropped top and trousers that were very loose round the waist. I am not sure if that was by design or if the lady had recently lost weight.

When she sat down most of her cute little backside was exposed. It came out almost completely, not just a little bit of builders' bum. She appeared to be going commando as there were no panties to be seen.

I had never seen a woman have this type of clothing malfunction before. She didn't make any attempt to prevent it happening or correct it. It seems unlikely she could have been unaware of it. I wonder if it was a premediated flash.

Accidental flash
 

My wife is a classic example, we have been married for 58 years now and over those years I have seen her get into all sorts of trouble, one time we went to a pub/restaurant she had a halter neck dress on held up by a metal clip, the clip failed and landed in her soup, she was in the middle of the dining area and by the time she had cleaned her straps from the soup everyone had had a good look at her 38b tits.

Another one was when she was fundraising for a dog charity doing a meet and greet at a large pet superstore, she had a pair of loose summer trousers on and as she walked across the carpark with her two dogs on leads and their beds , water and a folding chair to sit on her trousers suddenly started to slip down hoping she could make the safety of the store she kept going,only for her trousers to drop completely down to her ankles , there she stood in her thong with her arms full unable to pull them up, a quick thinking guy took some of the gear from her and had a close view of her backside as she bent over to pull them up while still holding onto her dogs, the guy was good enough to carry her stuff to the door for her, well he'd had his reward !!!.

My SIL fit this category very well. Her 1st husband was a big basketball fan, so she wore the team jerseys frequently, the arm hole on basketball jerseys are big, so everytime she extended her arm her boob on that side was exposed, it happened so often I think I stopped staring. Between husbands she would stay with us and go on beach trips. She had this green 2 piece, the top was loose, so her nipples were viewable, but the best part were the bottoms, the made it look like her vulva was spray painted, always a great cameltoe.

Back when I was 18 I knew a girl named Sharon. She would always wear loose tops and her bra for whatever reason was just slightly too big. Every time she bent over you could see her bright pink nipples as clear as day. It happened all the time. I caught her much hotter sister a couple times too but not nearly as much as her.

Something similar happened to my wife while she was traversing a busy city centre road at a pedestrian crossing. Much to the delight of a grinning truck driver waiting at the lights, her long wrap-around tie-up skirt fell off completely. Apparently, she had to walk back in her thong to pick it up from the ground.

Tube Tops
 

Couple decades ago I was at a Dead show, lawn seats, girl near me was wearing a tube top.
Every once in a while she'd have a boob bounce out of it while dancing, and pretend not to notice until both were out.
We smiled at each other, this happened all afternoon. After dark she just took the top off.
Had I been single and a decade or two younger, this might have been a longer story :-)